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Patented Feb. 25, 1924.

cannon w. amen, s nnivmoris'iynnw i onic, nssxonom'ro umon-cnnsm'nw can,

'nnroLnmzm'c mixrunnnnn: msn'rzzon or rnnewme m shun I L: e r Twill-indium iz maj/ concern-a v 1i Be-It: known tlntt: l5,- (lnonon I. Erase; -u. some of on U ni'tedfitutes; melding 1 113131111 lam-st, "in stile-1 counqi ;ol.;Qnecns and State otul hse'fdl a 1m gfo vgcnients'in Dspolarizlng -.\'Ll'xturesr:und=- Ictliods of Preparing the. Same, oi Whl'Clk' tlIB following especificction;

0 This invention "relates 1o .a z'xleg'aolerizi-ng "1i:ixluirc-conslst-in essentially-10f mningu nefse dioxide nlul caron in .u -"novehstutecb physiciil acsccialio'n'anrl exhibiting fl/hlfil; degree of'depolu'riz'ing elllciencyaimdrj cc of the Lcelunch type. 1 "'lli iinveig'tionulscrelittesitoia"novel constitlaent 'ei'np'loycd" in" the prepornilqn of sun, dcpol'airininm ni'ix tiirc's? em}; w: methods of finc' azii'ing slfilPmix't u'res. 4 l the application of Williem ll. Clymer; fins i eiaiejmpei17 1920;serial flqffloma, n lagl iwfilbcdlzd engines- 2 highs ofidiom dcpoluljgihglmit turc obta 'e -'by milling t gcfl QXflFyr l IsKo ja'ntl e: cubenah-eons niatex i'e'l until an extreme intin'i'dcy of contact between the carbon and the J'yl'b lnsite conigonents existscind a highl avorable sl'n'ficcme'x iosnr relation is o tained. The advantageous properties lure are ascribed 1n the said Clymer application, at least in part, to the fact, that the carbon being the softer component, mterncts with'thc pyrolusite during the milling operation in such :1 fashion thetthe cerbrm. cools the pyrolusitc particles 10. the finished product, and my invesi'igations tend to so port this conclusion.

I liar-c found that when certain pyrm lusites which are relativel soil; and friable are used in accordance wit the Clymer proposal, t-lie results are not so good as when the usual hard varieties of pyrolusite are so employed, indicating that the properties of the ultimate product 0 the 101m millin are to suns exient dependentunon' the her ness of the pyrcissitc used. ()nc object of my invention is s process which will make it ossicle to produce equally good results wit-n such friable varieties of pyrolusits.

My invention also includes no rovements in the joint milling process Whercm ertificlsl manganese dioxideis the (lapel-mining consituent and wherein such artificial mengansss dioxideis indureted .to increase its oi such a mix- V llbdifiding ti' nupon llhcacarlionaceons constituent"during millmg.- 1' 4. I hove found l3hel; .by saturating" varieties of; manganese dioxide. which arc-,dcficienls inuhardn ss .u'rith solutions n33 suitable scltsthe mlzdznrc so obtainedi and then-.d'ryin file-men anese io'xidcjs so cpmpocted an mdumte' that. ibheconges much'betterede ed. for-Ame in the joint milling process. 3 he solutions with which .the nmnguncse .dioig-ifie isiuitially impregnated should preferably f conminno'substances which are detrimental to ithe=action-of a dry battery, since linithc processhereinafter toi-be described the solid components of t-he solutiou-remaln in the depolarizing mix and hncein'; the finished battery. The electrolyte solution commonly employed in dry batteries containing zinc chloride and ammonium c loride; obyious- 1y answers this; requirement,.. aind since it has the necessary inch-rating action i-tis my preferred agentfor the .purpose, A'e sp crfic examnle will scnve further: to. illustrate the invention:

A 'fri able pyrolusitedeficientin hair-inch igi crushed To a fineness oi about one -eighth inch, satin-Med with "zinc chloride amm'onium allowed to dry. The resulting hard compact mass is then crushed, fignexnmple to pass a screen preferably not er thun 80 mesh. Petroleum coke calcined to about 1600110 1800 C. and suitably crushed, is mixed with the indurabcd pyrolusite and the resulting mixture is then milled for several hours in a pebble mill or e uivclcnt device for mechanical reduction. Ihc times and math cds of milling disclosed in the said {Jlymcr apyiilicctions are suitable, with the except-ion tint wet milling is not adapted for use in connection with my invention.

While I have obtained good results using the carbon in an initially relatively coarse condition, as recommended in the Clymer application, I have also used carbon which was initiclly much finer, with equally good results.

The sufiiciently milled mix is used in any suitable way in the preparation of the bet.- tery, as by forming it into depolarizing bobbins or tampln itintozinc cup electrodes around a car on electrode centered in the cup. If electrolyte salts have been em played in indumtxng the manganese material,

chloride electrolyte "solution" and l 

